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microwave background radiation. And so there's a property that light has, right? Light is strongly coupled to spacetime. So as spaceime expands, light that is traveling through that spaceime,
it gets its wavelength stretched out by the same amount that space expanded while the light was traveling through it. And so all of the CMBB, even if along different directions, lines of sight, the
the the rate of expansion is slightly different, the cosmic microwave background radiation kind of averages out over these nuisance parameters. And so it can serve as a convenient clock. Emergence
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